214 



BULLETIN 50, UNITED STATES NATIONAL MUSEUM 



ee. Size larger, wing over 430 mm. (Siberia; nw. Alaska). 



B. lagopus kamtschatkensis, juv. (p. 336) 

 dd. Abdomen much marked with blackish, but marks not forming an un- 

 broken band; terminal half of tail with two or three grayish white 

 bars, 

 e. Size smaller, wing under 430 mm. 



B. lagopus s.-johannis, ad., light phase (p. 325) 

 ee. Size larger, wing over 430 mm. (Siberia; nw. Alaska). 



B. lagopus kamtschatkensis, ad. (p. 336) 



Figure 16. — Buteo (Brewsteria) regalis. 



aa. Tarsi unfeathered for greatest (lower) part. 



b. Longest primary exceeding distal secondary by much less than one-third 

 length of wing. 

 c. Plumage generally solid brown, not blue-gray above. 

 d. Pale bands on rectrices very narrow, 

 e. Breast gray; abdomen white barred with rufescent (Hispaniola). 



B. ridgwayi, ad. (p. 293) 

 ee. Breast white streaked with gray; abdomen white streaked with 



rufescent (Hispaniola) B. ridgwayi, juv. (p. 294) 



dd. Pale bands on the rectrices very broad (more than 12 mm.). 

 e. Head and upperparts very light, pale drab-gray to neutral gray. 

 /. Breast uniform gray (eastern Panama). 



B. magnirostris insidiatrix, ad. (p. 350) 

 //. Breast buffy white streaked with dusky (eastern Panama), 



B. magnirostris insidiatrix, juv. (p. 350) 

 ee. Head and upperparts darker, always with a brownish color generally. 

 /. Pale interspaces of rectrices without a trace of rufous. 

 g. Underparts whitish streaked with reddish brown. 



